Dr. Nabulsi has represented Syria in many conferences since 1993. Among these conferences was the Islamic Educational, Scientific and Cultural Organization – ISESCO conference which was held in Rabat in 1999. He also participated in the Family Conference, which was held in Abu Dhabi in 1998, he participated in the Islamic Fiqh Conference, that was held in USA, Detroit, he participated in the two Muslim Youth Conferences, that were held in Los Angeles in 1998 and 1999 and the Supreme Council for Islamic Affairs conference, which was held in Cairo in 1999, 2005 and 2006.
Moreover, he participated in the 8th Islamic Baraka symposium for Islamic economy, that was held in Damascus in 1999, the 6th World Conference of Scientific Inimitability of the Quran and Sunnah, that was held in Beirut in 2000, the Endowment Experiments symposium in the Levant, which was held in Damascus 2000, and the conference of the Endowment Ministers in the Islamic World, which was held in Malaysia in 2002.
Dr. Nabulsi participated in the Conference of Social Upbringing, which was held in Damascus, and he prepared a worksheet about the role of religious institutions in social upbringing in 2005. He also participated in the Hashemite Councils in Jordan Amman for several years, and he participated in the Holy Quran Award in Dubai for several years as well.
He responded to several invitations to give presentations in many Arab countries such as Libya, Algeria, Oman, Bahrain, Lebanon, Jordan, Kuwait and the United Arab Emirates. He represented Syria at the Conference of Population, which was held in Bali, Indonesia, in 2007, and he represented Syria at the Population Conference, which was held in Cairo in 2008, when he played a major role in revealing the vicious goals of the conference, contradicting it and drawing the attention of the Ummah to the dangers of what was put forward in the conference. He participated in the 4th International Islamic Forum in Algeria in 2008, and he responded to the call of the International Scientific Inimitability Commission in Algeria in 2009.
He responded as well to the invitation of the German government. He went there with official personnel, and he met university, religious and political leaders there. He also delivered a speech in the German Parliament.
Moreover, Dr. Nabulsi responded to the invitation of the Chinese government to visit Beijing and see the conditions of Muslims in China with official personnel. He responded as well to the official invitation to visit Saudi Arabia, the Hashemite Kingdom of Jordan, Yemen Republic and the Sudan Republic. In addition, he responded to the official invitation to visit the Guinea Republic.
Dr. Nabulsi responded to the several invitations of people to give lectures in many states in the United States of America, and he responded to an invitation to give lectures in Australia for several years.
He responded the invitation of the Muslim Community in France several times, the invitation of the Muslim Community in Germany, the invitation of the Muslim Community in Istanbul for several years, the invitation of the Muslim Community in Switzerland, and the invitation of the Muslim Community in Sweden.
Dr. Nabulsi gave lectures in several cities in Lebanon.